From e7e6385876577e04101a9b9ed8d10c34f634c905 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 11 Jun 2020 12:41:18 -0700
Subject: [PATCH] x86_64: Use %xmmN with vpxor to clear a vector register

Since "vpxor %xmmN, %xmmN, %xmmN" clears the whole vector register, use
%xmmN, instead of %ymmN, with vpxor to clear a vector register.

(cherry picked from commit a35a59036ebae3efcdf5e8167610e0656fca9770)
---
 sysdeps/x86_64/multiarch/strcmp-avx2.S  | 4 ++--
 sysdeps/x86_64/multiarch/strrchr-avx2.S | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index 433ae047..70d8499b 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -105,8 +105,8 @@ ENTRY (STRCMP)
 # endif
 	movl	%edi, %eax
 	xorl	%edx, %edx
-	/* Make %ymm7 all zeros in this function.  */
-	vpxor	%ymm7, %ymm7, %ymm7
+	/* Make %xmm7 (%ymm7) all zeros in this function.  */
+	vpxor	%xmm7, %xmm7, %xmm7
 	orl	%esi, %eax
 	andl	$(PAGE_SIZE - 1), %eax
 	cmpl	$(PAGE_SIZE - (VEC_SIZE * 4)), %eax
diff --git a/sysdeps/x86_64/multiarch/strrchr-avx2.S b/sysdeps/x86_64/multiarch/strrchr-avx2.S
index 9f22a15e..c949410b 100644
--- a/sysdeps/x86_64/multiarch/strrchr-avx2.S
+++ b/sysdeps/x86_64/multiarch/strrchr-avx2.S
@@ -48,7 +48,7 @@ ENTRY (STRRCHR)
 	movl	%edi, %ecx
 	/* Broadcast CHAR to YMM4.  */
 	VPBROADCAST %xmm4, %ymm4
-	vpxor	%ymm0, %ymm0, %ymm0
+	vpxor	%xmm0, %xmm0, %xmm0
 
 	/* Check if we may cross page boundary with one vector load.  */
 	andl	$(2 * VEC_SIZE - 1), %ecx
-- 
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